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SELECT CO.Continent, TRUNCATE(AVG(CI.POPULATION),0) FROM CITY AS CI INNER JOIN COUNTRY AS CO ON CI.CountryCode = CO.Code GROUP BY CO.Continent;
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Average Population of Each Continent
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SELECT CO.Continent, TRUNCATE(AVG(CI.POPULATION),0) FROM CITY AS CI INNER JOIN COUNTRY AS CO ON CI.CountryCode = CO.Code GROUP BY CO.Continent;